{2532} Primeκαίkai{kahee}Apparently a primary particle, having a copulative and sometimes also a cumulative force; and, also, even, so, then, too, etc.; often used in connection (or composition) with other particles or small words.

{1492} Primeεἰδῶeido{i-do'}A primary verb; used only in certain past tenses, the others being borrowed from the equivalent, G3700 and G3708; properly to see (literally or figuratively); by implication (in the perfect only) to know.

{1492} Primeεἰδῶeido{i-do'}A primary verb; used only in certain past tenses, the others being borrowed from the equivalent, G3700 and G3708; properly to see (literally or figuratively); by implication (in the perfect only) to know.

{2192} Primeἔχωecho{ekh'-o}A primary verb (including an alternate form σχέω [[scheo]], {skheh'-o}; used in certain tenses only); to hold (used in very various applications, literally or figuratively, direct or remote; such as possession, ability, contiguity, relation or condition).

{0846} Primeαὐτόςautos{ow-tos'}From the particle αὖ [[au]] (perhaps akin to the base of G0109 through the idea of a baffling wind; backward); the reflexive pronoun self, used (alone or in the compound of G1438) of the third person, and (with the proper personal pronoun) of the other persons.

1 John 5:15

_ _ hear  Greek, “that He heareth us.”

_ _ we have the petitions that we desired of him  We have, as present possessions, everything whatsoever we desired (asked) from Him. Not one of our past prayers offered in faith, according to His will, is lost. Like Hannah, we can rejoice over them as granted even before the event; and can recognize the event when it comes to pass, as not from chance, but obtained by our past prayers. Compare also Jehoshaphat’s believing confidence in the issue of his prayers, so much so that he appointed singers to praise the Lord beforehand.

1 John 5:15

We have  Faith anticipates the blessings. The petitions which we asked of him  Even before the event. And when the event comes, we know it comes in answer to our prayer.

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if:

Proverbs 15:29 The LORD [is] far from the wicked: but he heareth the prayer of the righteous.Jeremiah 15:12-13Shall iron break the northern iron and the steel? ... Thy substance and thy treasures will I give to the spoil without price, and [that] for all thy sins, even in all thy borders.

we know:

Mark 11:24 Therefore I say unto you, What things soever ye desire, when ye pray, believe that ye receive [them], and ye shall have [them].Luke 11:9-10 And I say unto you, Ask, and it shall be given you; seek, and ye shall find; knock, and it shall be opened unto you. ... For every one that asketh receiveth; and he that seeketh findeth; and to him that knocketh it shall be opened.